D1551_D1553 installation manual 27042022 V2
Dimensions for D1553
Installation
Mount the metal enclosure onto the wall.
Connect the Live, Earth and Neutral terminals to an un-switched fused spur.
Connect the On/Off switching control to the control unit. Select the mode of operation using the
jumper (see below).
Connect the Normally Closed relay output to the monitoring equipment used to report and signal
equipment faults.
Connect the 12V power output to the system.
Switch on the AC supply and confirm that the AC OK LED is lit.
External Power Supply (AC Supply)
The power supply has a three-way terminal block for Live, Earth and Neutral connections. When
supplied boxed, earth is connected to the metal enclosure and the lid earthed with a flying push-fit
lead.
12V Power Output
Terminal blocks are provided to connect to the system. The output is floating and can be referenced
to earth if required. The output is controlled by the ON/OFF input (see below). The output is
electronically short circuit and overload protected and suitable for switching highly inductive loads.
The short circuit protection is intelligent, and power will be restored when a short is removed when
still connected to the load, requiring no further user/installer intervention.
The output switch-on retry time is adaptive and will be extended to a maximum of 18 seconds after
a long duration short to prevent excessive switch power dissipation.
